新型叠合柱-混凝土梁边节点的受力性能试验研究  

Experimental Study on Mechanical Behavior of New Type Side Joint of CFST Composite Column-Concrete Beam

作　　者：凌育洪[1,2] 温新贵 郑文丽 方小丹[1,3] 周靖 LING Yuhong;WEN Xingui;ZHENG Wenli;FANG Xiaodan;ZHOU Jing(State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510640,Guangdong,China;School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,Guangdong,China;Architecture Design Research Institute,South China University of Technology,Guangzhou 510640,Guangdong,China)

机构地区：[1]华南理工大学亚热带建筑科学国家重点实验室,广东广州510640 [2]华南理工大学土木与交通学院,广东广州510640 [3]华南理工大学建筑设计研究院有限公司,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2022年第1期38-49,共12页Journal of South China University of Technology(Natural Science Edition)

基　　金：亚热带建筑科学国家重点实验室项目(2021Z12);国家自然科学基金资助项目(12172135)。

摘　　要：为使钢管混凝土叠合柱-混凝土梁节点能得到广泛应用,提出一种新型钢管混凝土叠合柱-混凝土梁的连接节点,利用设置于叠合柱中钢管外的环筋平衡混凝土框架梁端纵筋的拉力,梁端纵筋以卡扣、弯折等形式与柱中环筋连接。制作6个边节点试件,进行梁受弯单调加载试验,考察节点试件的裂缝发展及分布、变形、破坏形态、承载力以及延性,揭示梁纵筋锚固构造的传力机制。试验结果表明,试件的裂缝集中于梁根部的塑性铰区,表现为弯曲破坏形态,有充分的塑性变形能力,延性系数大于普通钢筋混凝土柱-梁节点的延性系数;梁根部受拉侧纵筋均能在柱中环筋屈服前以及试件达到峰值荷载前屈服;试验过程中未出现梁纵筋和柱中环筋应变突变现象。梁纵筋与柱中环筋的3种连接构造形式具有类似的受力性能,均锚固可靠。利用ABAQUS程序对试验过程进行仿真模拟分析,计算结果与试验结果吻合。A new type of joint between concrete-encased concrete-filled steel tubular(CFST)columns and concrete beam was proposed to make wide use of the joint of concrete-filled steel tubular composite column-concrete beam.The tensile force of longitudinal reinforcement at the beam end of the concrete frame was balanced by the ring reinforcement outside the steel tube in the composite column.The longitudinal reinforcement at the beam end was connected with the ring reinforcement in the column in the form of buckle,bending and so on.Six side joints were made and tested under bending monotonic load in order to test the distribution and development of cracks,deformation,failure mode,bearing capacity and ductility of the side joints.And the force transfer mechanism of the anchorage structure of longitudinal reinforcement was revealed.The test results show that,the cracks of the specimens are concentrated in the plastic hinge area at the end of the beam and shows a bending failure mode with sufficient plastic deformation capacity;the ductility coefficient is greater than that of the ordinary reinforced concrete column beam joint;the longitudinal reinforcement at the tensile side of the beam end can yield before the ring bars yield in the column and the specimen reaches the peak load;there is no strain mutation in the longitudinal reinforcement of beam and ring reinforcement of column in the test.The results show that the three connection forms of longitudinal reinforcement and ring reinforcement have similar mechanical performance,and they are all anchored reliably.The test process was simulated by ABAQUS program,which proved the consistence between the calculated results and the test results.

关 键 词：叠合柱-混凝土梁边节点 力学行为 柱中环筋 梁端纵筋 卡扣 弯折 

分 类 号：TU398[建筑科学—结构工程]